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Q: Rough running and not enough power on 1999 Volvo V70

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My V70 drives rough but the idel is ok, the check engine light is not on. It doesn't overheat. When in PARK I press the gas pedal it makes a rough (grrrrrrr)sound. When driving it makes the rough (grrrrrr) sound and doesn't accelarte as quickly as before from stop or while on the move. I have checked the spark plugs and they are ok. The ignition coil boot had a cut and I replaced it and no change. Can you help?
(3) Answers
(1) Comments
Hi,
I would check the codes anyway, some may be stored even if the light is off.
The fuel pumps can fail on these, I would check the fuel pressure and power to the pump when it is shutting off.
Check the easy things first:
-spark plugs
-wires
-cap and rotor *if DI ignition*
-blocked or failing Catalytic Converter

(after driving feel the exhaust before and after the cat, as well as the cat itsself. If the cat-back is a major heat difference than in front deem the converter a fail and replace)
One of the ignition coils was bad. I have changed it and have changed the spark plugs. The rough grrr is gone, but I have a different problem now. The engine shuts off after driving for 5 minutes. I guess when it heats up then it shuts off. Any ideas?
youg might have a bad fuel relay or your fuel pump might have abad seal or air filter might need replaced